GB/T 26949.7-2023 Industrial trucks - Verification of stability - Part 7: Bidirectional and multidirectional trucks
1 Scope
This document specifies the tests for verifying the stability of bidirectional and multidirectional trucks with tilting or non-tilting mast or fork arms.
It is also applicable to trucks operating under the same conditions when equipped with load-handling attachments.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5053-1, Industrial trucks - Terminology and classification - Part 1: Types of industrial trucks
ISO 22915-1, Industrial trucks - Verification of stability - Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053-1 and ISO 22915-1 apply.
4 Test conditions
4.1 General
The test conditions shall be in accordance with ISO 22915-1.
4.2 Position of the truck on the tilt table
4.2.1 Load/steer axle and drive/steer axle
The load/steer axle and drive/steer axle are defined by Figure 1.
4.2.2 Tests 1 to 5
The truck shall be positioned on the tilt table so that its drive/steer axle, B–B, and outrigger (load/steer) axle, C–C, are parallel to the tilt axis, X–Y, of the tilt table. See Table 1.
4.2.3 Tests 6 to 9
The truck shall be positioned on the tilt table with the line, M–N, or the outrigger (load/steer) axle, C–C, parallel to the tilt axis, X–Y, of the tilt table. See Table 1.
Point M is defined as follows.
a) For trucks with a sprung castor wheel: point M shall be the vertical projection onto the tilt table of the point of intersection between the centreline of the drive/steer axle and the centreline of the drive wheel width.
b) For trucks with drive/steer wheels in an articulated frame: point M shall be the vertical projection onto the tilt table of the point of intersection between the articulated frame axle and the lateral axis of the articulated frame.
c) For trucks with a single drive/steer wheel: point M shall be the vertical projection onto the tilt table of the point of intersection between the centreline of the drive/steer axle and the centreline of the drive wheel width.
As shown in Table 1, point N is defined as the centre point of the area of contact between the tilt table surface and the load wheel nearest to the tilt axis, X–Y, of the tilt table.
4.3 Datum point positions
4.3.1 General
Test 1 may be conducted with the horizontal position of the load datum point, E, unchanged when elevated from its lowered position as shown in Figure 2.
With the prescribed test load, set the mast vertical and then elevate to approximately 300 mm above the tilt table. With the shank of the front face of the fork arm set vertical, establish point E, as shown in Figure 2 a) and b), on the fork arms or fork carrier having a fixed relationship to the centre of gravity of the test load. Point E shall be used to provide a reference datum point, F, on the tilt table. When the mast is elevated, a new point, F1 , on the tilt table might occur, as shown in Figure 2 c) and d). This new point may be returned to the original location of F, as shown in Figure 2 e) and f).
For trucks with tilting masts, changes in the location of F1 may be corrected by varying the tilt of the mast within the limits provided by the design of the truck. See Figure 2 a), c) and e).
For trucks with non-tilting masts, the location of F1 is subject to regional requirements (see 4.3.2).
4.3.2 Regional requirements for trucks with non-tilting masts
The location of F1 shall not be corrected. Only correction by varying the mast tilt is permissible. Adjustments in the fork arms or fork carrier tilt, fork carrier retraction (where provided) or retraction of the mast may be used to correct for changes in the location of point F1 , within the limits provided by the design of the truck. See Figure 2 b), d) and f).
4.4 Lift height for tests simulating travel
For tests simulating travel (Tests 5, 6 and 7), the upper face of the fork arms, measured at the heel of the fork arm, shall be positioned 300 mm above the tilt table for trucks with a rated capacity less than or equal to 10 t, and 500 mm for trucks with a rated capacity of greater than 10 t.
Standard
GB/T 26949.7-2023 Industrial trucks—Verification of stability—Part 7:Bidirectional and multidirectional trucks (English Version)
Standard No.
GB/T 26949.7-2023
Status
valid
Language
English
File Format
PDF
Word Count
10500 words
Price(USD)
315.0
Implemented on
2024-6-1
Delivery
via email in 1~3 business day
Detail of GB/T 26949.7-2023
Standard No.
GB/T 26949.7-2023
English Name
Industrial trucks—Verification of stability—Part 7:Bidirectional and multidirectional trucks
GB/T 26949.7-2023 Industrial trucks - Verification of stability - Part 7: Bidirectional and multidirectional trucks
1 Scope
This document specifies the tests for verifying the stability of bidirectional and multidirectional trucks with tilting or non-tilting mast or fork arms.
It is also applicable to trucks operating under the same conditions when equipped with load-handling attachments.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5053-1, Industrial trucks - Terminology and classification - Part 1: Types of industrial trucks
ISO 22915-1, Industrial trucks - Verification of stability - Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053-1 and ISO 22915-1 apply.
4 Test conditions
4.1 General
The test conditions shall be in accordance with ISO 22915-1.
4.2 Position of the truck on the tilt table
4.2.1 Load/steer axle and drive/steer axle
The load/steer axle and drive/steer axle are defined by Figure 1.
4.2.2 Tests 1 to 5
The truck shall be positioned on the tilt table so that its drive/steer axle, B–B, and outrigger (load/steer) axle, C–C, are parallel to the tilt axis, X–Y, of the tilt table. See Table 1.
4.2.3 Tests 6 to 9
The truck shall be positioned on the tilt table with the line, M–N, or the outrigger (load/steer) axle, C–C, parallel to the tilt axis, X–Y, of the tilt table. See Table 1.
Point M is defined as follows.
a) For trucks with a sprung castor wheel: point M shall be the vertical projection onto the tilt table of the point of intersection between the centreline of the drive/steer axle and the centreline of the drive wheel width.
b) For trucks with drive/steer wheels in an articulated frame: point M shall be the vertical projection onto the tilt table of the point of intersection between the articulated frame axle and the lateral axis of the articulated frame.
c) For trucks with a single drive/steer wheel: point M shall be the vertical projection onto the tilt table of the point of intersection between the centreline of the drive/steer axle and the centreline of the drive wheel width.
As shown in Table 1, point N is defined as the centre point of the area of contact between the tilt table surface and the load wheel nearest to the tilt axis, X–Y, of the tilt table.
4.3 Datum point positions
4.3.1 General
Test 1 may be conducted with the horizontal position of the load datum point, E, unchanged when elevated from its lowered position as shown in Figure 2.
With the prescribed test load, set the mast vertical and then elevate to approximately 300 mm above the tilt table. With the shank of the front face of the fork arm set vertical, establish point E, as shown in Figure 2 a) and b), on the fork arms or fork carrier having a fixed relationship to the centre of gravity of the test load. Point E shall be used to provide a reference datum point, F, on the tilt table. When the mast is elevated, a new point, F1 , on the tilt table might occur, as shown in Figure 2 c) and d). This new point may be returned to the original location of F, as shown in Figure 2 e) and f).
For trucks with tilting masts, changes in the location of F1 may be corrected by varying the tilt of the mast within the limits provided by the design of the truck. See Figure 2 a), c) and e).
For trucks with non-tilting masts, the location of F1 is subject to regional requirements (see 4.3.2).
4.3.2 Regional requirements for trucks with non-tilting masts
The location of F1 shall not be corrected. Only correction by varying the mast tilt is permissible. Adjustments in the fork arms or fork carrier tilt, fork carrier retraction (where provided) or retraction of the mast may be used to correct for changes in the location of point F1 , within the limits provided by the design of the truck. See Figure 2 b), d) and f).
4.4 Lift height for tests simulating travel
For tests simulating travel (Tests 5, 6 and 7), the upper face of the fork arms, measured at the heel of the fork arm, shall be positioned 300 mm above the tilt table for trucks with a rated capacity less than or equal to 10 t, and 500 mm for trucks with a rated capacity of greater than 10 t.
